Audio
Speakers-on-a-Chip
Speakers-on-a-Chip Wideband Full Duplex
Mono Speakerphone SoC
CX20662
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for communications and consumer applications.
The CX20662 speakerphone System-on-Chip (SoC) is one of Conexant’s
Speakers-on-a-Chip (SPoC) solutions with the proprietary low cost on-chip
Digital Signal Processor (DSP) performing wideband full-duplex hands-free
speakerphone applications. The SPoC integrates the functionality of a DSP,
audio codec, programmable microphone boost, and Class-D amplifier in one
cost-effective 40-pin Quad Flat-No Lead (QFN) package.
The device features dual integrated codecs, a hardware Acoustic Echo
Cancellation (AEC) DSP, Line Echo Supression (LES), Noise Reduction (NR),
microphone boost, headphone driver and Class-D amplifier. The device
eliminates the need for an external speaker amplifier and has low external Bill
of Materials (BOM) for speaker output. This turnkey solution can be integrated
with any analog audio system to deliver high quality hands-free speakerphone
function.
Applications
• Intercom systems
• Telepresence Webcam with speakerphone
• Full duplex hands-free telephony
UART
EEPROM
GPIO
Distinguishing Features
• Wideband acoustic echo cancellation DSP
engine exceeding TIA 920 requirement
• Line echo suppression
• Integrated 600mW Class-D amplifier,
filterless output wth selectable gains
32
C lass-AB
DAC
Analog Out
Speakerphone
On/Off
Digital Volum e
Control
Analog Volum e
Potentiom eter
Low Res
AD C
• AEC DSP tuning parameters
•
Voice activity detection with comfort
noise
• Speech-trained acoustic echo cancellation
• Microphone noise reduction filter
• Power saving mode
Jack Sense
(AEC, NR, LES)
AD C
Analog In
DSP
MIC Mute
Boost
D AC
AD C
MIC LED
•
Fast convergence trained from half duplex
to full duplex
• UART MCU interface
Speaker Mute
Boost
32
C lass-AB
Class-D
Speaker LED
M icrophone
Speakers
Mono Line Out or
Mono Headphone
CX20662 Block Diagram
Part Number
CX20662
Description
Speakers-on-a-Chip Wideband Full
Duplex Mono Speakerphone SoC
CONEXANT [ CONEXANT SYSTEMS, INC ]
